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Most mechanical control switch housings are designed to
allow 360° positioning of the cable entries by loosening the
set screw. See figure 4. On high temperature applications
(above 120° C [250° F]), high temperature wire should be
used between control and first junction box located in a
cooler area.
1. To gain access to switch mechanism(s) remove switch
housing cover.
2. Pull in supply wires (conductors), wrap them around
enclosing tube under the baffle plate and connect to
proper terminals. Be certain that excess wire does not
interfere with "tilt" of switch and that adequate clearance
exists for replacement of switch housing cover.
nOTE: See bulletin on switch mechanism furnished with
your control (as listed aside) for proper connections.
3. Connect power supply to control and test switch action
by varying liquid level in tank or vessel.
nOTE: If switch mechanism fails to function properly, check
vertical alignment of control housing and consult installation
instructions in switch mechanism bulletin.
4. Replace switch housing cover and place control into ser-
vice.
OBSERVE ALL APPLICABLE ELECTRICAL CODES AND PROPER WIRING PROCEDURES
NEMA 4x/7/9
Set screw
CAUTION:
- DO NOT attempt to reposition NEMA 4x / 7/9
housings without loosening the set screws.
4
WiRing
nOTE: If control has been furnished with an explosion proof
(cast) or moisture proof (gasketed) switch housing, check
the following:
– After wiring connections have been completed, housings
must be sealed via the correct cable gland to prevent
entrance of air.
– Check cover to base fit, to be certain gasketed joint is
tight. A positive seal is necessary to prevent infiltration of
moisture laden air or corrosive gases into switch housing.
CAUTION:
In hazardous area, do not power the unit until
the cable gland is sealed and the enclosure
cover is screwed down securely.
Switch Series
Letter
L
Mercury Switch w/Beaded Leads
S
L
Vibration Resistant Mercury Switch
F
Hermetically Sealed Snap Switch
NEMA 7/9
Description
Dry Contact Switch DC current
Set screw
Set screw
position
screw
Bulletin
N°
42-783
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